Liner for rubberized material and method of treating the same



Oct. 19 1926. 1,603,320

H. J. CONROY ET AL 7 LINER FOR RUBBERIZED MATERIAL AND METHOD OFTREATING THE SAME Filed Dec. 11, 1922 SULPHUR CON TAING RUBBER SULPHURlMPREGNATED LINER.

INVENTORS Hep/yd Conrqy and BuJm/AHa /worih.

Patented Oct. "19, 1926.

UNITED. STATES PATENT OFFICE. a

HENRY J. CONROY, OF AKRON,

I QHIO, AND RUSSELL A. HATWORTH, DEE-TORONTO, ONTARIO, CA'NAD'A,ASSIGNORS TO THE AKRON, OHIO, A CORPORATION or OHIO.

GOODYEAR TIRE & RUBBER COMPA NY OF LINER FOR RUBBERIZED MATERIAL AnnMETHOD or TREATINGgTHE SAME.

Application filed December 111, 1922. Serial No. 606,350.

Our invention pertains to the manufacture v of rubber and of rubberizedimaterial, and'it has particular relation to a method of treating theliners which are adapted-to be so 6 disposed between the adjacent layersthereof as to prevent adhesion of the rubber to "the liners. a

a It is customary in the manufacture of rubberized material,particularly of the sheet- 10 ing type, to cause the same to move intoengagement with and to be deposited upon a liner, composed of fibrousmaterial, upon leaving the calender rolls. The liner, with 'the rubberdisposed thereon, is then placed 5 in layers or rolled into any desiredcompact form. Considerable difliculty has been experienced in this stageof the manufacture owing to the fact that certain rubber stocks,

\ particularly the tube stocks, have a strongtendency-to adhere to 0during warm Weather.

sults in the loss of both time and material. By our invention, We haveobviated the aforementioned diificulties by so impregnatthe liners,especially This frequently re- 12 mgthe liners, prior to the depositionof the ber thereon, as to prevent the adhesion of :the rubber thereto.This is accomplished by impregnating the liners with. sulphur,

which causes bloom.'of the rubber which is deposited thereon, thuspreventing the rubber from adheringto the liners. Oneembodiment theaccompanying drawing which includes a sulphur treated liner engaging asulphur .containing. rubber composition. I

In-practicing our invention we desire to, cause bloom of the rubber bybringing free sulphur 'into engagementwitlfthe surface of the rubber,thus initiating migration of sulphur from the-sulphur super-saturatedrubber compound In order to causea deposition of free sulphur to bebrought into engagement with the rubber, the liners are impregnatedthere 45 with. A quantity of sul hur' is dissolved in i a vat of carbonbisulphide, through' which a single form which scope of the appended ofour invention is illustrated in the liner is passed. The liner is thendried,

preferably by passing it over a steam table,

thus evaporating the carbon bisulphide and causing a deposition of freesulphur to remain in the liner. Owing to the highly infiammablenature ofcarbon bisulphide, we prefer to mix therewith a.quantity of car bontetrachloride, or other suitable material, which serves to materiallyreduce the fire hazard. while passing over the steam table.

Although our invention is described as employing carbonbisulphidemixedwith carbon tetrachloride as a means for impregnating the liner with thesulphur, it is obvious that any other desirable. .material; may beemployed under like conditions, the essential requirement being th"posited upon the liner which will serve to at a material be decausebloom of the'rubber. Although We have described in detail but ourinvention may assume, it will be; apparent to those skilled in the artthat it is not so limited but that various minor modifications andchanges may be made therein Without departing from the spirit of ourinvention or from the claims. What we claim is:

LA process which comprises bringing a sulphur impregnated fabric intocontact with a sheet of unvulcanized rubber.

2. A combination of layers of unvulcanized rubber and sulphurimpregnated liner. p 3. A process which comprises bringing sulphurvimpregnated fabric into contact with a sheet of unvulcanized rubbercontain ing sulphur. a

4. The combination of layers of unvulcanized sulphur containing rubberandsul- "phur impregnated liner. I

In witness whereof, We have hereunto.

signed our names.- a a HENRY J. 'CONROY. RUSSELL A. HAYWORTH.

